<template>
	<view class="nav">
		<view :style="'height:' + status + 'rpx;' + containerStyle"></view>
		<view v-if="isHome" class="headNav" :style="'height:' + navHeight + 'rpx;' + 'line-height:' + navHeight + 'rpx;'+ 'padding-left:20rpx;'">
			<text class="city">中部地区</text>
			<view style="flex: 1;">
				<navigator url="/pages/search/index" :style="'height:' + menu.height*2 + 'rpx;' + 'line-height:' + menu.height*2 + 'rpx;' + 'margin-top:' + (menu.top*2 - status) + 'rpx;'
				 + 'margin-left:32rpx;'+'margin-right:'+ (menu.width*2 + 24) + 'rpx;' 
				 + 'background:#f4f4f4;border-radius:200rpx;text-align:center'">
					<text class="search-text">找医院</text>
				</navigator>
			</view>
		</view>
		<view v-else class="navbar" :style="'height:' + navHeight +'rpx;' + containerStyle">
			<view class="back-icon" @click="backOrHome">
				<image v-if="pages > 1" src="/static/resource/navbar/ic_back.png"></image>
				<image v-else src="/static/resource/navbar/ic_home.png"></image>
			</view>
			<view class="nav-title" v-if="titleText">
				<view :style="'height:' + navHeight + 'rpx;' + 'line-height:' + navHeight + 'rpx;' + textStyle">
					{{titleText}}
				</view>
			</view>
		</view>
	</view>
</template>

<script setup>
	import {onBeforeMount,ref, reactive} from 'vue';
	const props = defineProps({
		background:{
			type:String,
			default:'rgba(255,255,255,1)' 		
		},
		color:{
			type:String,
			default:'rgba(0,0,0,1)' 		
		},
		fontSize:{
			type:Number,
			default:32 		
		},
		iconWidth:{
			type:Number,
			default:116 		
		},
		iconHeight:{
			type:Number,
			default:38 		
		},
		titleText:{
			type:String,
			default:''
		},
		isHome:{
			type:Boolean,
			default:false
		}
	})
	const emits = defineEmits(['navBarAttached'])
	onBeforeMount(() => {
		setNavSize()
		setStyle()
		emits('navBarAttached',{
			detail:{
				statusHeight: status.value,
				navHeight: navHeight.value,
				navBarHeight: status.value + navHeight.value
			}
		})
	})
	// 定义状态栏高度
	const status = ref(0)
	// 定义内容高度
	const navHeight = ref(0)
	//背景颜色
	const containerStyle = ref('')
	// 字体样式
	const textStyle = ref('')
	// 图标样式
	const iconStyle = ref('')
	// 定义页面栈的数量
	const pages = ref(getCurrentPages().length)
	// console.log(pages.value ,'page');
	// 获取胶囊的位置信息
	const menu = reactive(uni.getMenuButtonBoundingClientRect())
	// 计算状态栏高度
	const setNavSize = () => {
		const {system,statusBarHeight} = uni.getSystemInfoSync()
		status.value = statusBarHeight * 2
		const isiOS = system && system.indexOf('iOS') > -1
		if(!isiOS){
			navHeight.value = 96
		}else{
			navHeight.value = 88
		}
		
	}
	// 样式设置
	const setStyle = () => {
		containerStyle.value = ['background:' + props.background].join(';')
		textStyle.value = ['color:' + props.color,'font-size:' + props.fontSize + 'rpx'].join(';')
		iconStyle.value = ['width:' + props.iconWidth + 'rpx','height:' + props.iconHeight + 'rpx'].join(';')
	}
	
	// 页面跳转函数
	const backOrHome = () => {
		if(pages.value > 1){
			uni.navigateBack()
		}else{
			uni.switchTab({
				url:'/pages/index/index'
			})
		}
	}
</script>

<style>
	.nav {
		position: fixed;
		width: 100%;
		top: 0;
		left: 0;
		z-index: 2;
	}
	.back-icon{
		display: flex;
		align-items: center;
		height: 100%;
		width: 64rpx;
		margin-left: 20rpx;
	}
	.back-icon image{
		width: 64rpx;
		height: 64rpx;
	}
	.navbar{
		position: relative;
	}
	.nav-title{
		position: absolute;
		top: 0;
		left: 50%;
		transform: translate(-50%);
	}
	.headNav{
		display: flex;
	}
	.city {
	    display: inline-block;
	    position: relative;
	    font-size: 30rpx;
	    font-weight: bold;
	    padding-left: 55rpx;
	    background: url()
	        no-repeat left center;
	    background-size: 40rpx;
	}
	
	.city:after {
	    content: ' ';
	    display: inline-block;
	    height: 6px;
	    width: 6px;
	    border-width: 1px 1px 0 0;
	    border-color: #353535;
	    border-style: solid;
	    -webkit-transform: matrix(0.71, 0.71, -0.71, 0.71, 0, 0);
	    transform: matrix(0.71, 0.71, -0.71, 0.71, 0, 0);
	    position: relative;
	    top: -2px;
	    position: absolute;
	    top: 50%;
	    margin-top: -4px;
	    right: -10px;
	}
	.search-text {
	    display: inline-block;
	    padding-left: 30rpx;
	    color: #bbbbbb;
	    font-size: 26rpx;
	    background: url()
	        no-repeat left center;
	    background-size: 23rpx;
	}
</style>